Optical imaging lens including seven lenses of −++−++− or −++−+−− refractive powers

ABSTRACT

An optical imaging lens includes a first lens element to a seventh lens element, and each lens element has an object-side surface and an image-side surface. The optical axis region of the image-side surface of the first lens element is concave, the periphery region of the image-side surface of the second lens element is concave, the optical axis region of the image-side surface of the fourth lens element is concave, the optical axis region of the object-side surface of the fifth lens element is concave, the optical axis region of the image-side surface of the sixth lens element is concave, the seventh lens element has negative refracting power, lens elements included by the optical imaging lens are only the seven lens elements, and the following conditions: ALT/(T2+G23)≤5.000 is satisfied.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention generally relates to an optical imaging lens.Specifically speaking, the present invention is directed to an opticalimaging lens for use in a portable electronic device such as a mobilephone, a camera, a tablet personal computer, or a personal digitalassistant (PDA) for taking pictures or for recording videos.

2. Description of the Prior Art

In recent years, the optical imaging lens has been evolving. In additionto requiring the lens to be light and short, it is increasinglyimportant to improve the imaging quality such as aberration andchromatic aberration. However, in order to meet the requirements,increasing the number of optical lens elements will also increase thedistance from the object-side surface of the first lens element to theimage plane on the optical axis, which is not conducive to the thinningof mobile phones and digital cameras. Therefore, it is a developmentgoal of the design to provide a light, thin and short optical imaginglens with good imaging quality.

In addition, the large field of view has gradually become a designtrend, and how to design optical imaging lens with small f-number andlarge field of view is also a focus of research and development.

SUMMARY OF THE INVENTION

In light of the above, the present invention proposes an optical imaginglens of seven lens elements which has shorter system length, largerfiled of view angle, good imaging quality and technically possible. Theoptical imaging lens of seven lens elements of the present inventionfrom an object side to an image side in order along an optical axis hasa first lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element and aseventh lens element. Each first lens element, second lens element,third lens element, fourth lens element, fifth lens element, sixth lenselement and seventh lens element respectively has an object-side surfacewhich faces toward the object side to allow imaging rays to pass throughas well as an image-side surface which faces toward the image side toallow the imaging rays to pass through.

In one embodiment of the present invention, an optical axis region ofthe image-side surface of the first lens element is concave, a peripheryregion of the image-side surface of the second lens element is concave,an optical axis region of the image-side surface of the fourth lenselement is concave, an optical axis region of the object-side surface ofthe fifth lens element is concave, an optical axis region of theimage-side surface of the sixth lens element is concave, the seventhlens element has negative refracting power, lens elements included bythe optical imaging lens are only the seven lens elements describedabove, and the optical imaging lens satisfies the relationship:ALT/(T2+G23)≤5.000, ALT is a sum of thicknesses of all the seven lenselements along the optical axis, T2 is a thickness of the second lenselement along the optical axis, G23 is an air gap between the secondlens element and the third lens element along the optical axis.

In another embodiment of the present invention, an optical axis regionof the image-side surface of the first lens element is concave, thefourth lens element has negative refracting power, and an optical axisregion of the image-side surface of the fourth lens element is concave,an optical axis region of the object-side surface of the fifth lenselement is concave, an optical axis region of the image-side surface ofthe sixth lens element is concave, the seventh lens element has negativerefracting power, lens elements included by the optical imaging lens areonly the seven lens elements described above, and the optical imaginglens satisfies the relationship: ALT/(T2+G23)≤5.000, wherein ALT is asum of thicknesses of all the seven lens elements along the opticalaxis, T2 is a thickness of the second lens element along the opticalaxis, G23 is an air gap between the second lens element and the thirdlens element along the optical axis.

In another embodiment of the present invention, an optical axis regionof the image-side surface of the first lens element is concave, thesecond lens element has positive refracting power, and a peripheryregion of the image-side surface of the second lens element is concave,an optical axis region of the image-side surface of the third lenselement is convex, an optical axis region of the object-side surface ofthe fourth lens element is convex, and a periphery region of theimage-side surface of the fourth lens element is concave, an opticalaxis region of the image-side surface of the sixth lens element isconcave, an optical axis region of the image-side surface of the seventhlens element is concave, lens elements included by the optical imaginglens are only the seven lens elements described above, and the opticalimaging lens satisfies the relationship: ALT/(T2+G23)≤5.000, ALT is asum of thicknesses of all the seven lens elements along the opticalaxis, T2 is a thickness of the second lens element along the opticalaxis, G23 is an air gap between the second lens element and the thirdlens element along the optical axis.

In the optical imaging lens of the present invention, the embodimentsmay also selectively satisfy the following optical conditions:(T3+T5)/T4≥5.000;  1.EFL/(G23+T3)≤2.500;  2.ALT/BFL≤4.000;  3.AAG/(G12+T2)≤2.500;  4.G23/(G56+G67)≥2.500;  5.EFL/(G45+G67)≤6.600;  6(T5+T6+T7)/T1≥2.800;  7(T3+G34)/T7≥2.500;  8.TL/AAG≥3.000;  9.TTL/(EFL+T4)≥2.300;  10.(T7+BFL)/T5≤2.600;  11.(G23+T5)/T6≥3.000;  12.ALT/EFL≥1.200;  13.(T4+T5)/G23≤2.600;  14.ALT/(G56+T6+G67)≥5.000;  15.T3/(G34+T4+G45)≥1.000;  16.T3/T1≥1.400.  17.

In the present invention, T1 is a thickness of the first lens elementalong the optical axis, T2 is a thickness of the second lens elementalong the optical axis, T3 is a thickness of the third lens elementalong the optical axis, T4 is a thickness of the fourth lens elementalong the optical axis, T5 is a thickness of the fifth lens elementalong the optical axis, T6 is a thickness of the sixth lens elementalong the optical axis, T7 is a thickness of the seventh lens elementalong the optical axis, G12 is an air gap between the first lens elementand the second lens element along the optical axis, G23 is an air gapbetween the second lens element and the third lens element along theoptical axis, G34 is an air gap between the third lens element and thefourth lens element along the optical axis, G45 is an air gap betweenthe fourth lens element and the fifth lens element along the opticalaxis, G56 is an air gap between the fifth lens element and the sixthlens element along the optical axis, G67 is an air gap between the sixthlens element and the seventh lens element along the optical axis, ALT isa sum of seven thicknesses from the first lens element to the seventhlens element along the optical axis, TL is a distance from theobject-side surface of the first lens element to the image-side surfaceof the seventh lens element along the optical axis, TTL is the distancefrom the object-side surface of the first lens element to an image planealong the optical axis, BFL is a distance from the image-side surface ofthe seventh lens element to the image plane along the optical axis, AAGis a sum of six air gaps from the first lens element to the seventh lenselement along the optical axis, EFL is an effective focal length of theoptical imaging lens; ImgH is the image height of the optical imaginglens.

Besides, an Abbe number of the first lens element is υ1; an Abbe numberof the second lens element is υ2; an Abbe number of the third lenselement is υ3; an Abbe number of the fourth lens element is υ4; an Abbenumber of the fifth lens element is υ5; an Abbe number of the sixth lenselement is υ6; and an Abbe number of the seventh lens element is υ7.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-5 illustrate the methods for determining the surface shapes andfor determining optical axis region or periphery region of one lenselement.

FIG. 6 illustrates a first embodiment of the optical imaging lens of thepresent invention.

FIG. 7A illustrates the longitudinal spherical aberration on the imageplane of the first embodiment.

FIG. 7B illustrates the field curvature aberration on the sagittaldirection of the first embodiment.

FIG. 7C illustrates the field curvature aberration on the tangentialdirection of the first embodiment.

FIG. 7D illustrates the distortion of the first embodiment.

FIG. 8 illustrates a second embodiment of the optical imaging lens ofthe present invention.

FIG. 9A illustrates the longitudinal spherical aberration on the imageplane of the second embodiment.

FIG. 9B illustrates the field curvature aberration on the sagittaldirection of the second embodiment.

FIG. 9C illustrates the field curvature aberration on the tangentialdirection of the second embodiment.

FIG. 9D illustrates the distortion of the second embodiment.

FIG. 10 illustrates a third embodiment of the optical imaging lens ofthe present invention.

FIG. 11A illustrates the longitudinal spherical aberration on the imageplane of the third embodiment.

FIG. 11B illustrates the field curvature aberration on the sagittaldirection of the third embodiment.

FIG. 11C illustrates the field curvature aberration on the tangentialdirection of the third embodiment.

FIG. 11D illustrates the distortion of the third embodiment.

FIG. 12 illustrates a fourth embodiment of the optical imaging lens ofthe present invention.

FIG. 13A illustrates the longitudinal spherical aberration on the imageplane of the fourth embodiment.

FIG. 13B illustrates the field curvature aberration on the sagittaldirection of the fourth embodiment.

FIG. 13C illustrates the field curvature aberration on the tangentialdirection of the fourth embodiment.

FIG. 13D illustrates the distortion of the fourth embodiment.

FIG. 14 illustrates a fifth embodiment of the optical imaging lens ofthe present invention.

FIG. 15A illustrates the longitudinal spherical aberration on the imageplane of the fifth embodiment.

FIG. 15B illustrates the field curvature aberration on the sagittaldirection of the fifth embodiment.

FIG. 15C illustrates the field curvature aberration on the tangentialdirection of the fifth embodiment.

FIG. 15D illustrates the distortion of the fifth embodiment.

FIG. 16 illustrates a sixth embodiment of the optical imaging lens ofthe present invention.

FIG. 17A illustrates the longitudinal spherical aberration on the imageplane of the sixth embodiment.

FIG. 17B illustrates the field curvature aberration on the sagittaldirection of the sixth embodiment.

FIG. 17C illustrates the field curvature aberration on the tangentialdirection of the sixth embodiment.

FIG. 17D illustrates the distortion of the sixth embodiment.

FIG. 18 illustrates a seventh embodiment of the optical imaging lens ofthe present invention.

FIG. 19A illustrates the longitudinal spherical aberration on the imageplane of the seventh embodiment.

FIG. 19B illustrates the field curvature aberration on the sagittaldirection of the seventh embodiment.

FIG. 19C illustrates the field curvature aberration on the tangentialdirection of the seventh embodiment.

FIG. 19D illustrates the distortion of the seventh embodiment.

FIG. 20 illustrates an eighth embodiment of the optical imaging lens ofthe present invention.

FIG. 21A illustrates the longitudinal spherical aberration on the imageplane of the eighth embodiment.

FIG. 21B illustrates the field curvature aberration on the sagittaldirection of the eighth embodiment.

FIG. 21C illustrates the field curvature aberration on the tangentialdirection of the eighth embodiment.

FIG. 21 D illustrates the distortion of the eighth embodiment.

FIG. 22 shows the optical data of the first embodiment of the opticalimaging lens.

FIG. 23 shows the aspheric surface data of the first embodiment.

FIG. 24 shows the optical data of the second embodiment of the opticalimaging lens.

FIG. 25 shows the aspheric surface data of the second embodiment.

FIG. 26 shows the optical data of the third embodiment of the opticalimaging lens.

FIG. 27 shows the aspheric surface data of the third embodiment.

FIG. 28 shows the optical data of the fourth embodiment of the opticalimaging lens.

FIG. 29 shows the aspheric surface data of the fourth embodiment.

FIG. 30 shows the optical data of the fifth embodiment of the opticalimaging lens.

FIG. 31 shows the aspheric surface data of the fifth embodiment.

FIG. 32 shows the optical data of the sixth embodiment of the opticalimaging lens.

FIG. 33 shows the aspheric surface data of the sixth embodiment.

FIG. 34 shows the optical data of the seventh embodiment of the opticalimaging lens.

FIG. 35 shows the aspheric surface data of the seventh embodiment.

FIG. 36 shows the optical data of the eighth embodiment of the opticalimaging lens.

FIG. 37 shows the aspheric surface data of the eighth embodiment.

FIG. 38 shows some important ratios in the embodiments.

FIG. 39 shows some important ratios in the embodiments.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis.

The imaging rays pass through the optical system to produce an image onan image plane. The term “a lens element having positive refractingpower (or negative refracting power)” means that the paraxial refractingpower of the lens element in Gaussian optics is positive (or negative).The term “an object-side (or image-side) surface of a lens element”refers to a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1 ). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1 , a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4 ), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2 , optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2 . Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2 . Accordingly, sincethe extension line EL of the ray intersects the optical axis I on theobject side A1 of the lens element 200, periphery region Z2 is concave.In the lens element 200 illustrated in FIG. 2 , the first transitionpoint TP1 is the border of the optical axis region and the peripheryregion, i.e., TP1 is the point at which the shape changes from convex toconcave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex-(concave-) region,” can be usedalternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3 , only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3 , since the shape of the optical axisregion Z1 is concave, the shape of the periphery region Z2 will beconvex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4 , a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4 , theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5 , the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

As shown in FIG. 6 , the optical imaging lens 1 of seven lens elementsof the present invention, sequentially located from an object side A1(where an object is located) to an image side A2 along an optical axisI, has a first lens element 10, a second lens element 20, an aperturestop (ape. stop) 80, a third lens element 30, a fourth lens element 40,a fifth lens element 50, a sixth lens element 60, a seventh lens element70, a filter 90 and an image plane 91. Generally speaking, the firstlens element 10, the second lens element 20, the third lens element 30,the fourth lens element 40, the fifth lens element 50, the sixth lenselement 60 and the seventh lens element 70 may be made of a transparentglass material but the present invention is not limited to this, andeach has an appropriate refracting power. In the present invention, lenselements having refracting power included by the optical imaging lens 1are only the seven lens elements (the first lens element 10, the secondlens element 20, the third lens element 30, the fourth lens element 40,the fifth lens element 50, the sixth lens element 60 and the seven lenselement 70) described above. The optical axis I is the optical axis ofthe entire optical imaging lens 1, and the optical axis of each of thelens elements coincides with the optical axis of the optical imaginglens 1.

Furthermore, the optical imaging lens 1 includes an aperture stop (ape.stop) 80 disposed in an appropriate position. In FIG. 6 , the aperturestop 80 is disposed between the second lens element 20 and the thirdlens element 30. When light emitted or reflected by an object (notshown) which is located at the object side A1 enters the optical imaginglens 1 of the present invention, it forms a clear and sharp image on theimage plane 91 at the image side A2 after passing through the first lenselement 10, the second lens element 20, the third lens element 30, theaperture stop 80, the fourth lens element 40, the fifth lens element 50,the sixth lens element 60, the seventh lens element 70 and the filter90. In one embodiment of the present invention, the filter 90 is placedbetween the seventh lens element 70 and the image plane 91. The optionalfilter 90 may be a filter of various suitable functions, for example,the filter 90 may be an infrared cut filter (IR cut filter), which isused to prevent infrared rays in the imaging ray from being transmittedto the image plane 91 to affect the imaging quality.

Each lens element in the optical imaging lens 1 of the present inventionhas an object-side surface facing toward the object side A1 to allowimaging rays to pass through as well as an image-side surface facingtoward the image side A2 to allow the imaging rays to pass through. Forexample, the first lens element 10 has an object-side surface 11 and animage-side surface 12, the second lens element 20 has an object-sidesurface 21 and an image-side surface 22, the third lens element 30 hasan object-side surface 31 and an image-side surface 32, the fourth lenselement 40 has an object-side surface 41 and an image-side surface 42,the fifth lens element 50 has an object-side surface 51 and animage-side surface 52, the sixth lens element 60 has an object-sidesurface 61 and an image-side surface 62, and the seventh lens element 70has an object-side surface 71 and an image-side surface 72. In addition,each object-side surface and image-side surface in the optical imaginglens 1 of the present invention has an optical axis region and aperiphery region.

Each lens element in the optical imaging lens 1 of the present inventionfurther has a thickness T along the optical axis I. For example, thefirst lens element 10 has a first lens element thickness T1, the secondlens element 20 has a second lens element thickness T2, the third lenselement 30 has a third lens element thickness T3, the fourth lenselement 40 has a fourth lens element thickness T4, the fifth lenselement 50 has a fifth lens element thickness T5, the sixth lens element60 has a sixth lens element thickness T6, the seventh lens element 70has a seventh lens element thickness T7. Therefore, the sum of seventhicknesses from the first lens element to the seventh lens element inthe optical imaging lens 1 along the optical axis I isALT=T1+T2+T3+T4+T5+T6+T7.

In addition, between two adjacent lens elements in the optical imaginglens 1 of the present invention there may be an air gap along theoptical axis I. For example, there is an air gap G12 between the firstlens element 10 and the second lens element 20, an air gap G23 betweenthe second lens element 20 and the third lens element 30, an air gap G34between the third lens element 30 and the fourth lens element 40, an airgap G45 between the fourth lens element 40 and the fifth lens element50, an air gap G56 between the fifth lens element 50 and the sixth lenselement 60 as well as an air gap G67 between the sixth lens element 60and the seventh lens element 70. Therefore, the sum of six air gaps fromthe first lens element 10 to the seventh lens element 70 along theoptical axis I is AAG=G12+G23+G34+G45+G56+G67.

In addition, a distance from the object-side surface 11 of the firstlens element 10 to the image plane 91 along the optical axis I is TTL,namely a system length of the optical imaging lens 1; an effective focallength of the optical imaging lens is EFL; a distance from theobject-side surface 11 of the first lens element 10 to the image-sidesurface 72 of the seventh lens element 70 along the optical axis I isTL; HFOV stands for the half field of view which is half of the field ofview of the entire optical imaging lens element system; ImgH is theimage height of the optical imaging lens 1, and Fno is the f-number ofthe optical imaging lens 1.

When the filter 90 is placed between the seventh lens element 70 and theimage plane 91, the air gap between the seventh lens element 70 and thefilter 90 along the optical axis I is G7F; the thickness of the filter90 along the optical axis I is TF; the air gap between the filter 90 andthe image plane 91 along the optical axis I is GFP; and the distancefrom the image-side surface 72 of the seventh lens element 70 to theimage plane 91 along the optical axis I is BFL. Therefore,BFL=G7F+TF+GFP.

Furthermore, the focal length of the first lens element 10 is f1; thefocal length of the second lens element 20 is f2; the focal length ofthe third lens element 30 is f3; the focal length of the fourth lenselement 40 is f4; the focal length of the fifth lens element 50 is f5;the focal length of the sixth lens element 60 is f6; the focal length ofthe seventh lens element 70 is f7; the refractive index of the firstlens element 10 is n1; the refractive index of the second lens element20 is n2; the refractive index of the third lens element 30 is n3; therefractive index of the fourth lens element 40 is n4; the refractiveindex of the fifth lens element 50 is n5; the refractive index of thesixth lens element 60 is n6; the refractive index of the seventh lenselement 70 is n7; an Abbe number of the first lens element 10 is υ1; anAbbe number of the second lens element 20 is υ2; an Abbe number of thethird lens element 30 is υ3; an Abbe number of the fourth lens element40 is υ4; an Abbe number of the fifth lens element 50 is υ5; an Abbenumber of the sixth lens element 60 is υ6; and an Abbe number of theseventh lens element 70 is υ7.

First Embodiment

Please refer to FIG. 6 which illustrates the first embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG. 7Afor the longitudinal spherical aberration on the image plane 91 of thefirst embodiment; please refer to FIG. 7B for the field curvatureaberration on the sagittal direction; please refer to FIG. 7C for thefield curvature aberration on the tangential direction; and please referto FIG. 7D for the distortion aberration. The Y axis of the sphericalaberration in each embodiment is “field of view” for 1.0. The Y axis ofeach aberration and the distortion in each embodiment stands for “imageheight” (ImgH), and the image height of the first embodiment is 2.549mm.

Only the seven lens elements 10, 20, 30, 40, 50, 60 and 70 of theoptical imaging lens 1 of the first embodiment have refracting power.The optical imaging lens 1 also has an aperture stop 80, a filter 90,and an image plane 91. The aperture stop 80 is provided between thesecond lens element 20 and the third lens element 30.

The first lens element 10 has negative refracting power. An optical axisregion 13 of the object-side surface 11 of the first lens element 10 isconcave, and a periphery region 14 of the object-side surface 11 of thefirst lens element 10 is convex. An optical axis region 16 of theimage-side surface 12 of the first lens element 10 is concave, and aperiphery region 17 of the image-side surface 12 of the first lenselement 10 is concave. Besides, both the object-side surface 11 and theimage-side surface 12 of the first lens element 10 are asphericsurfaces, but it is not limited thereto.

The second lens element 20 has positive refracting power. An opticalaxis region 23 of the object-side surface 21 of the second lens element20 is convex, and a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is convex. An optical axis region 26 of theimage-side surface 22 of the second lens element 20 is concave, and aperiphery region 27 of the image-side surface 22 of the second lenselement 20 is concave. Besides, both the object-side surface 21 and theimage-side surface 22 of the second lens element 20 are asphericsurfaces, but it is not limited thereto.

The third lens element 30 has positive refracting power. An optical axisregion 33 of the object-side surface 31 of the third lens element 30 isconvex, and a periphery region 34 of the object-side surface 31 of thethird lens element 30 is convex. An optical axis region 36 of theimage-side surface 32 of the third lens element 30 is convex, and aperiphery region 37 of the image-side surface 32 of the third lenselement 30 is convex. Besides, both the object-side surface 31 and theimage-side surface 32 of the third lens element 30 are asphericsurfaces, but it is not limited thereto.

The fourth lens element 40 has negative refracting power. An opticalaxis region 43 of the object-side surface 41 of the fourth lens element40 is convex, and a periphery region 44 of the object-side surface 41 ofthe fourth lens element 40 is concave. An optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is concave, and aperiphery region 47 of the image-side surface 42 of the fourth lenselement 40 is concave. Besides, both the object-side surface 41 and theimage-side surface 42 of the fourth lens element 40 are asphericsurfaces, but it is not limited thereto.

The fifth lens element 50 has positive refracting power. An optical axisregion 53 of the object-side surface 51 of the fifth lens element 50 isconcave, and a periphery region 54 of the object-side surface 51 of thefifth lens element 50 is convex. An optical axis region 56 of theimage-side surface 52 of the fifth lens element 50 is convex, and aperiphery region 57 of the image-side surface 52 of the fifth lenselement 50 is concave. Besides, both the object-side surface 51 and theimage-side surface 52 of the fifth lens element 50 are asphericsurfaces, but it is not limited thereto.

The sixth lens element 60 has positive refracting power. An optical axisregion 63 of the object-side surface 61 of the sixth lens element 60 isconvex, and a periphery region 64 of the object-side surface 61 of thesixth lens element 60 is concave. An optical axis region 66 of theimage-side surface 62 of the sixth lens element 60 is concave, and aperiphery region 67 of the image-side surface 62 of the sixth lenselement 60 is convex. Besides, both the object-side surface 61 and theimage-side surface 62 of the sixth lens element 60 are asphericsurfaces, but it is not limited thereto.

The seventh lens element 70 has negative refracting power. An opticalaxis region 73 of the object-side surface 71 of the seventh lens element70 is convex, and a periphery region 74 of the object-side surface 71 ofthe seventh lens element 70 is concave. An optical axis region 76 of theimage-side surface 72 of the seventh lens element 70 is concave, and aperiphery region 77 of the image-side surface 72 of the seventh lenselement 70 is convex. Besides, both the object-side surface 71 and theimage-side surface 72 of the seventh lens element 70 are asphericsurfaces, but it is not limited thereto.

In the first lens element 10, the second lens element 20, the third lenselement 30, the fourth lens element 40, the fifth lens element 50, thesixth lens element 60 and the seventh lens element 70 of the opticalimaging lens element 1 of the present invention, there are 14 surfaces,such as the object-side surfaces 11/21/31/41/51/61/71 and the image-sidesurfaces 12/22/32/42/52/62/72. If a surface is aspheric, these asphericcoefficients are defined according to the following formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/( {1 + \sqrt{1 - {( {1 + K} )\frac{Y^{2}}{R^{2}}}}} )} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

In which:

-   -   Y represents a vertical distance from a point on the aspheric        surface to the optical axis I;    -   Z represents the depth of an aspheric surface (the perpendicular        distance between the point of the aspheric surface at a distance        Y from the optical axis I and the tangent plane of the vertex on        the optical axis I of the aspheric surface);    -   R represents the curvature radius of the lens element surface;    -   K is a conic constant; and    -   a_(2i) is the aspheric coefficient of the 2i^(th) order.

The optical data of the first embodiment of the optical imaging lens 1are shown in FIG. 22 while the aspheric surface data are shown in FIG.23 . In the present embodiments of the optical imaging lens, thef-number of the entire optical imaging lens element system is Fno, EFLis the effective focal length, HFOV stands for the half field of viewwhich is half of the field of view of the entire optical imaging lenselement system, and the unit for the radius, the thickness and the focallength is in millimeters (mm). In this embodiment, TTL=5.271 mm;EFL=1.466 mm; HFOV=66.889 degrees; ImgH=2.549 mm; Fno=1.800.

Second Embodiment

Please refer to FIG. 8 which illustrates the second embodiment of theoptical imaging lens 1 of the present invention. It is noted that fromthe second embodiment to the following embodiments, in order to simplifythe figures, only the components different from what the firstembodiment has, and the basic lens elements will be labeled in figures.Other components that are the same as what the first embodiment has,such as the object-side surface, the image-side surface, the opticalaxis region and the periphery region will be omitted in the followingembodiments. Please refer to FIG. 9A for the longitudinal sphericalaberration on the image plane 91 of the second embodiment, please referto FIG. 9B for the field curvature aberration on the sagittal direction,please refer to FIG. 9C for the field curvature aberration on thetangential direction, and please refer to FIG. 9D for the distortionaberration. The components in this embodiment are similar to those inthe first embodiment, but the optical data such as the curvature radius,the lens thickness, the aspheric surface or the back focal length inthis embodiment are different from the optical data in the firstembodiment. In addition, in this embodiment, the periphery region 57 ofthe image-side surface 52 of the fifth lens element 50 is convex.

The optical data of the second embodiment of the optical imaging lensare shown in FIG. 24 while the aspheric surface data are shown in FIG.25 . In this embodiment, TTL=4.229 mm; EFL=1.540 mm; HFOV=66.889degrees; ImgH=2.550 mm; Fno=1.800. In particular: 1. The system lengthin this embodiment is smaller than the system length in the firstembodiment; 2. The longitudinal spherical aberration in this embodimentis smaller than the longitudinal spherical aberration in the firstembodiment; 3. The field curvature aberration on the sagittal directionin this embodiment is smaller than the field curvature aberration on thesagittal direction in the first embodiment; 4. The field curvatureaberration on the tangential direction in this embodiment is smallerthan the field curvature aberration on the tangential direction in thefirst embodiment; 5. The distortion aberration in this embodiment issmaller than the distortion aberration in the first embodiment.

Third Embodiment

Please refer to FIG. 10 which illustrates the third embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.11A for the longitudinal spherical aberration on the image plane 91 ofthe third embodiment; please refer to FIG. 11B for the field curvatureaberration on the sagittal direction; please refer to FIG. 11C for thefield curvature aberration on the tangential direction; and please referto FIG. 11D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment.

The optical data of the third embodiment of the optical imaging lens areshown in FIG. 26 while the aspheric surface data are shown in FIG. 27 .In this embodiment, TTL=5.195 mm; EFL=1.436 mm; HFOV=66.889 degrees;ImgH=2.550 mm; Fno=1.800. In particular: 1. The system length in thisembodiment is smaller than the system length in the first embodiment; 2.The longitudinal spherical aberration in this embodiment is smaller thanthe longitudinal spherical aberration in the first embodiment; 3. Thefield curvature aberration on the sagittal direction in this embodimentis smaller than the field curvature aberration on the sagittal directionin the first embodiment; 4. The field curvature aberration on thetangential direction in this embodiment is smaller than the fieldcurvature aberration on the tangential direction in the firstembodiment; 5. The distortion aberration in this embodiment is smallerthan the distortion aberration in the first embodiment.

Fourth Embodiment

Please refer to FIG. 12 which illustrates the fourth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.13A for the longitudinal spherical aberration on the image plane 91 ofthe fourth embodiment; please refer to FIG. 13B for the field curvatureaberration on the sagittal direction; please refer to FIG. 13C for thefield curvature aberration on the tangential direction; and please referto FIG. 13D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment. In addition, in thisembodiment, the periphery region 14 of the object-side surface 11 of thefirst lens element 10 is concave, the periphery region 57 of theimage-side surface 52 of the fifth lens element 50 is convex.

The optical data of the fourth embodiment of the optical imaging lensare shown in FIG. 28 while the aspheric surface data are shown in FIG.29 . In this embodiment, TTL=4.597 mm; EFL=1.587 mm; HFOV=66.889degrees; ImgH=2.549 mm; Fno=1.800. In particular: 1. The system lengthin this embodiment is smaller than the system length in the firstembodiment; 2. The longitudinal spherical aberration in this embodimentis smaller than the longitudinal spherical aberration in the firstembodiment; 3. The field curvature aberration on the sagittal directionin this embodiment is smaller than the field curvature aberration on thesagittal direction in the first embodiment; 4. The field curvatureaberration on the tangential direction in this embodiment is smallerthan the field curvature aberration on the tangential direction in thefirst embodiment; 5. The distortion aberration in this embodiment issmaller than the distortion aberration in the first embodiment.

Fifth Embodiment

Please refer to FIG. 14 which illustrates the fifth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.15A for the longitudinal spherical aberration on the image plane 91 ofthe fifth embodiment; please refer to FIG. 15B for the field curvatureaberration on the sagittal direction; please refer to FIG. 15C for thefield curvature aberration on the tangential direction, and please referto FIG. 15D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment. In addition, in thisembodiment, the periphery region 14 of the object-side surface 11 of thefirst lens element 10 is concave, the periphery region 57 of theimage-side surface 52 of the fifth lens element 50 is convex.

The optical data of the fifth embodiment of the optical imaging lens areshown in FIG. 30 while the aspheric surface data are shown in FIG. 31 .In this embodiment, TTL=4.523 mm; EFL=1.784 mm; HFOV=66.889 degrees;ImgH=2.549 mm; Fno=1.800. In particular: 1. The system length in thisembodiment is smaller than the system length in the first embodiment; 2.The field curvature aberration on the sagittal direction in thisembodiment is smaller than the field curvature aberration on thesagittal direction in the first embodiment; 3. The field curvatureaberration on the tangential direction in this embodiment is smallerthan the field curvature aberration on the tangential direction in thefirst embodiment; 4. The distortion aberration in this embodiment issmaller than the distortion aberration in the first embodiment.

Sixth Embodiment

Please refer to FIG. 16 which illustrates the sixth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.17A for the longitudinal spherical aberration on the image plane 91 ofthe sixth embodiment; please refer to FIG. 17B for the field curvatureaberration on the sagittal direction; please refer to FIG. 17C for thefield curvature aberration on the tangential direction, and please referto FIG. 17D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment. In addition, in thisembodiment, the periphery region 57 of the image-side surface 52 of thefifth lens element 50 is convex.

The optical data of the sixth embodiment of the optical imaging lens areshown in FIG. 32 while the aspheric surface data are shown in FIG. 33 .In this embodiment, TTL=5.456 mm; EFL=1.544 mm; HFOV=61.602 degrees;ImgH=2.520 mm; Fno=1.800. In particular: 1. The longitudinal sphericalaberration in this embodiment is smaller than the longitudinal sphericalaberration in the first embodiment; 2. The field curvature aberration onthe sagittal direction in this embodiment is smaller than the fieldcurvature aberration on the sagittal direction in the first embodiment;3. The field curvature aberration on the tangential direction in thisembodiment is smaller than the field curvature aberration on thetangential direction in the first embodiment; 4. The distortionaberration in this embodiment is smaller than the distortion aberrationin the first embodiment.

Seventh Embodiment

Please refer to FIG. 18 which illustrates the seventh embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.19A for the longitudinal spherical aberration on the image plane 91 ofthe seventh embodiment; please refer to FIG. 19B for the field curvatureaberration on the sagittal direction; please refer to FIG. 19C for thefield curvature aberration on the tangential direction, and please referto FIG. 19D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment. In addition, in thisembodiment, the periphery region 57 of the image-side surface 52 of thefifth lens element 50 is convex, the sixth lens element 60 has negativerefracting power.

The optical data of the seventh embodiment of the optical imaging lensare shown in FIG. 34 while the aspheric surface data are shown in FIG.35 . In this embodiment, TTL=5.563 mm; EFL=1.507 mm; HFOV=58.118degrees; ImgH=2.520 mm; Fno=1.800. In particular: 1. The longitudinalspherical aberration in this embodiment is smaller than the longitudinalspherical aberration in the first embodiment; 2. The field curvatureaberration on the sagittal direction in this embodiment is smaller thanthe field curvature aberration on the sagittal direction in the firstembodiment; 3. The field curvature aberration on the tangentialdirection in this embodiment is smaller than the field curvatureaberration on the tangential direction in the first embodiment; 4. Thedistortion aberration in this embodiment is smaller than the distortionaberration in the first embodiment.

Eighth Embodiment

Please refer to FIG. 20 which illustrates the eighth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.21A for the longitudinal spherical aberration on the image plane 91 ofthe eighth embodiment; please refer to FIG. 21B for the field curvatureaberration on the sagittal direction; please refer to FIG. 21C for thefield curvature aberration on the tangential direction, and please referto FIG. 21D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the curvature radius, the lens thickness, the asphericsurface or the back focal length in this embodiment are different fromthe optical data in the first embodiment. In addition, in thisembodiment, the periphery region 57 of the image-side surface 52 of thefifth lens element 50 is convex, the sixth lens element 60 has negativerefracting power, the periphery region 77 of the image-side surface 72of the seventh lens element 70 is concave.

The optical data of the eighth embodiment of the optical imaging lensare shown in FIG. 36 while the aspheric surface data are shown in FIG.37 . In this embodiment, TTL=4.948 mm; EFL=1.949 mm; HFOV=66.889degrees; ImgH=2.701 mm; Fno=1.800. In particular: 1. The system lengthin this embodiment is smaller than the system length in the firstembodiment; 2. The longitudinal spherical aberration in this embodimentis smaller than the longitudinal spherical aberration in the firstembodiment; 3. The field curvature aberration on the sagittal directionin this embodiment is smaller than the field curvature aberration on thesagittal direction in the first embodiment; 4. The field curvatureaberration on the tangential direction in this embodiment is smallerthan the field curvature aberration on the tangential direction in thefirst embodiment; 5. The distortion aberration in this embodiment issmaller than the distortion aberration in the first embodiment.

Some important ratios in each embodiment are shown in FIG. 38 and FIG.39 .

Each embodiment of the present invention provides an optical imaginglens which has good imaging quality. For example, the following lenselement concave or convex configuration may effectively reduce the fieldcurvature aberration and the distortion aberration to optimize theimaging quality of the optical imaging lens. Furthermore, the presentinvention has the corresponding advantages:

1. By designing the surface shape of the embodiment of the presentinvention. For example: the optical axis region 16 of the image-sidesurface 12 of the first lens element 10 is concave, and the optical axisregion 66 of the image-side surface 62 of the sixth lens element 60 isconcave, and if the following conditions are satisfied, it caneffectively correct the spherical aberration and aberration of theoptical system and reduce the distortion:

-   -   (a) The second lens element 20 has positive refracting power,        the periphery region 27 of the image-side surface 22 of the        second lens element 20 is concave, the optical axis region 36 of        the image-side surface 32 of the third lens element 30 is        convex, the optical axis region 43 of the object-side surface 41        of the fourth lens element 40 is convex, the periphery region 47        of the image-side surface 42 of the fourth lens element 40 is        concave, and the optical axis region 76 of the image-side        surface 72 of the seventh lens element 70 is concave.    -   (b) The aperture stop is disposed between the second lens        element 20 and the third lens element 30, the periphery region        27 of the image-side surface 22 of the second lens element 20 is        concave, the optical axis region 46 of the image-side surface 42        of the fourth lens element 40 is concave, the optical axis        region 53 of the object-side surface 51 of the fifth lens        element 50 is concave, and the seventh lens element 70 has        negative refracting power.    -   (c) The aperture stop is disposed between the second lens        element 20 and the third lens element 30, the fourth lens        element 40 has negative refracting power, the optical axis        region 46 of the image-side surface 42 of the fourth lens        element 40 is concave, the optical axis region 53 of the        object-side surface 51 of the fifth lens 50 element is concave,        and the seventh lens element 70 has negative refracting power.

When the above combination further satisfies the condition ofALT/(T2+G23)≤5.000, it can effectively shorten the system length of theoptical imaging lens and enlarge the field of view, and the preferablerange is 2.400≤ALT/(T2+G23)≤5.000.

2. In order to shorten the system length of optical imaging lens, theair gap between lens elements or lens thickness can be adjustedappropriately, but the difficulty of manufacturing and the imagingquality must be considered at the same time. Therefore, if the numericallimits of the following conditions are satisfied, the betterconfiguration can be obtained.

-   -   (T3+T5)/T4≥5.000, and the preferable range is        5.000≤(T3+T5)/T4≤7.000;    -   EFL/(G23+T3)≤2.500, and the preferable range is        0.800≤EFL/(G23+T3)≤2.500;    -   ALT/BFL≤4.000, and the preferable range is 1.500≤ALT/BFL≤4.000;    -   AAG/(G12+T2)≤2.500, and the preferable range is        1.200≤AAG/(G12+T2)≤2.500;    -   G23/(G56+G67)≥2.500, and the preferable range is        2.500≤G23/(G56+G67)≤6.300;    -   EFL/(G45+G67)≤6.600, and the preferable range is        2.200≤EFL/(G45+G67)≤6.600;        -   (T5+T6+T7)/T1≥2.800, and the preferable range is            2.800≤(T5+T6+T7)/T1≤6.000;        -   (T3+G34)/T7≥2.500, and the preferable range is            2.500≤(T3+G34)/T7≤4.100;    -   TL/AAG≥3.000, and the preferable range is 3.000≤TL/AAG≤5.100;    -   TTL/(EFL+T4)≥2.300, and the preferable range is        2.300≤TTL/(EFL+T4)≤3.200;        -   (T7+BFL)/T5≤2.600, and the preferable range is            1.000≤(T7+BFL)/T5≤2.600;        -   (G23+T5)/T6≥3.000, and the preferable range is            3.000≤(G23+T5)/T6≤6.000;    -   ALT/EFL≥1.200, and the preferable range is 1.200≤ALT/EFL≤2.500;        -   (T4+T5)/G23≤2.600, and the preferable range is            1.000≤(T4+T5)/G23≤2.600;    -   ALT/(G56+T6+G67)≥5.000, and the preferable range is        5.000≤ALT/(G56+T6+G67)≤8.300;    -   T3/(G34+T4+G45)≥1.000, and the preferable range is        1.000≤T3/(G34+T4+G45)≤2.000; and    -   T3/T1≥1.400, and the preferable range is 1.400≤T3/T1≤4.300.

By observing three representative wavelengths of 470 nm, 555 nm and 650nm in each embodiment of the present invention, it is suggested off-axislight of different heights of every wavelength all concentrates on theimage plane, and deviations of every curve also reveal that off-axislight of different heights are well controlled so the embodiments doimprove the spherical aberration, the astigmatic aberration and thedistortion aberration. In addition, by observing the imaging qualitydata the distances amongst the three representing different wavelengthsof 470 nm, 555 nm and 650 nm are pretty close to one another, whichmeans the embodiments of the present invention are able to concentratelight of the three representing different wavelengths so that theaberration is greatly improved. Given the above, it is understood thatthe embodiments of the present invention provides outstanding imagingquality.

In addition, any arbitrary combination of the parameters of theembodiments can be selected to increase the lens limitation so as tofacilitate the design of the same structure of the present invention.

In the light of the unpredictability of the optical imaging lens, thepresent invention suggests the above principles to have a shorter systemlength of the optical imaging lens, a reduced f-number, a larger fieldof view, better imaging quality or a better fabrication yield toovercome the drawbacks of prior art.

In addition to the above ratios, one or more conditional formulae may beoptionally combined to be used in the embodiments of the presentinvention and the present invention is not limit to this. The concave orconvex configuration of each lens element or multiple lens elements maybe fine-tuned to enhance the performance or the resolution. The abovelimitations may be selectively combined in the embodiments withoutcausing inconsistency.

The numeral value ranges within the maximum and minimum values obtainedfrom the combination ratio relationships of the optical parametersdisclosed in each embodiment of the invention can all be implementedaccordingly.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. An optical imaging lens, from an object side toan image side in order along an optical axis comprising: a first lenselement, a second lens element, an aperture stop, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element and aseventh lens element, the first lens element to the seventh lens elementeach having an object-side surface facing toward the object side andallowing imaging rays to pass through as well as an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough, wherein: an optical axis region of the image-side surface ofthe first lens element is concave; a periphery region of the image-sidesurface of the second lens element is concave; an optical axis region ofthe image-side surface of the fourth lens element is concave; an opticalaxis region of the object-side surface of the fifth lens element isconcave; an optical axis region of the image-side surface of the sixthlens element is concave; the seventh lens element has negativerefracting power; wherein lens elements included by the optical imaginglens are only the seven lens elements described above, and wherein theoptical imaging lens satisfies the relationship: ALT/(T2+G23)≤5.000,wherein ALT is a sum of thicknesses of all the seven lens elements alongthe optical axis, T2 is a thickness of the second lens element along theoptical axis, G23 is an air gap between the second lens element and thethird lens element along the optical axis.
 2. The optical imaging lensof claim 1, wherein T3 is a thickness of the third lens element alongthe optical axis, T4 is a thickness of the fourth lens element along theoptical axis, T5 is a thickness of the fifth lens element along theoptical axis, and the optical imaging lens satisfies the relationship:(T3+T5)/T4≥5.000.
 3. The optical imaging lens of claim 1, wherein EFL isan effective focal length of the optical imaging lens, T3 is a thicknessof the third lens element along the optical axis, and the opticalimaging lens satisfies the relationship:EFL/(G23+T3)≤2.500.
 4. The optical imaging lens of claim 1, wherein BFLis a distance from the image-side surface of the seventh lens element toan image plane along the optical axis, and the optical imaging lenssatisfies the relationship: ALT/BFL≤4.000.
 5. The optical imaging lensof claim 1, wherein AAG is a sum of six air gaps from the first lenselement to the seventh lens element along the optical axis, G12 is anair gap between the first lens element and the second lens element alongthe optical axis, and the optical imaging lens satisfies therelationship:AAG/(G12+T2)≤2.500.
 6. The optical imaging lens of claim 1, wherein G56is an air gap between the fifth lens element and the sixth lens elementalong the optical axis, G67 is an air gap between the sixth lens elementand the seventh lens element along the optical axis, and the opticalimaging lens satisfies the relationship: G23/(G56+G67)≥2.500.
 7. Theoptical imaging lens of claim 1, wherein EFL is an effective focallength of the optical imaging lens, G45 is an air gap between the fourthlens element and the fifth lens element along the optical axis, G67 isan air gap between the sixth lens element and the seventh lens elementalong the optical axis, and the optical imaging lens satisfies therelationship: EFL/(G45+G67)≤6.600.
 8. An optical imaging lens, from anobject side to an image side in order along an optical axis comprising:a first lens element, a second lens element, an aperture stop, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement and a seventh lens element, the first lens element to theseventh lens element each having an object-side surface facing towardthe object side and allowing imaging rays to pass through as well as animage-side surface facing toward the image side and allowing the imagingrays to pass through, wherein: an optical axis region of the image-sidesurface of the first lens element is concave; a periphery region of theimage-side surface of the second lens element is concave; the fourthlens element has negative refracting power, and an optical axis regionof the image-side surface of the fourth lens element is concave; anoptical axis region of the object-side surface of the fifth lens elementis concave; an optical axis region of the image-side surface of thesixth lens element is concave; the seventh lens element has negativerefracting power; wherein lens elements included by the optical imaginglens are only the seven lens elements described above, and wherein theoptical imaging lens satisfies the relationship: ALT/(T2+G23)≤5.000,wherein ALT is a sum of thicknesses of all the seven lens elements alongthe optical axis, T2 is a thickness of the second lens element along theoptical axis, G23 is an air gap between the second lens element and thethird lens element along the optical axis.
 9. The optical imaging lensof claim 8, wherein T1 is a thickness of the first lens element alongthe optical axis, T5 is a thickness of the fifth lens element along theoptical axis, T6 is a thickness of the sixth lens element along theoptical axis, T7 is a thickness of the seventh lens element along theoptical axis, and the optical imaging lens satisfies the relationship:(T5+T6+T7)/T1≥2.800.
 10. The optical imaging lens of claim 8, wherein T3is a thickness of the third lens element along the optical axis, T7 is athickness of the seventh lens element along the optical axis, G34 is anair gap between the third lens element and the fourth lens element alongthe optical axis, and the optical imaging lens satisfies therelationship: (T3+G34)/T7≥2.500.
 11. The optical imaging lens of claim8, wherein AAG is a sum of six air gaps from the first lens element tothe seventh lens element along the optical axis, TL is a distance fromthe object-side surface of the first lens element to the image-sidesurface of the seventh lens element along the optical axis, and theoptical imaging lens satisfies the relationship: TL/AAG≥3.000.
 12. Theoptical imaging lens of claim 8, wherein TTL is the distance from theobject-side surface of the first lens element to an image plane alongthe optical axis, EFL is an effective focal length of the opticalimaging lens, T4 is a thickness of the fourth lens element along theoptical axis, and the optical imaging lens satisfies the relationship:TTL/(EFL+T4)≥2.300.
 13. The optical imaging lens of claim 8, wherein T5is a thickness of the fifth lens element along the optical axis, T7 is athickness of the seventh lens element along the optical axis, BFL is adistance from the image-side surface of the seventh lens element to animage plane along the optical axis, and the optical imaging lenssatisfies the relationship: (T7+BFL)/T5≤2.600.
 14. The optical imaginglens of claim 8, wherein T5 is a thickness of the fifth lens elementalong the optical axis, T6 is a thickness of the sixth lens elementalong the optical axis, and the optical imaging lens satisfies therelationship:(G23+T5)/T6≥3.000
 15. The optical imaging lens of claim 1, wherein EFLis an effective focal length of the optical imaging lens, and theoptical imaging lens satisfies the relationship: ALT/EFL≥1.200.
 16. Theoptical imaging lens of claim 1, wherein T4 is a thickness of the fourthlens element along the optical axis, T5 is a thickness of the fifth lenselement along the optical axis, and the optical imaging lens satisfiesthe relationship: (T4+T5)/G23≤2.600.
 17. The optical imaging lens ofclaim 1, wherein T6 is a thickness of the sixth lens element along theoptical axis, G56 is an air gap between the fifth lens element and thesixth lens element along the optical axis, G67 is an air gap between thesixth lens element and the seventh lens element along the optical axis,and the optical imaging lens satisfies the relationship:ALT/(G56+T6+G67)≥5.000.
 18. The optical imaging lens of claim 1, whereinT3 is a thickness of the third lens element along the optical axis, T4is a thickness of the fourth lens element along the optical axis, G34 isan air gap between the third lens element and the fourth lens elementalong the optical axis, G45 is an air gap between the fourth lenselement and the fifth lens element along the optical axis, and theoptical imaging lens satisfies the relationship: T3/(G34+T4+G45)≥1.000.19. The optical imaging lens of claim 1, wherein T1 is a thickness ofthe first lens element along the optical axis, T3 is a thickness of thethird lens element along the optical axis, and the optical imaging lenssatisfies the relationship: T3/T1≥1.400.